Search code examples
node.jsexpressdotenv

dotenv is undefined in express

I have a .env file in my root directory that has PORT=4000 inside

My app.js has the following code

const express = require('express');
const app = express();
const port = process.env.PORT || 3000;

require('dotenv').config();

app.get('/', (req, res) => {
  res.send('Hello World!!!');
  console.log(port);
});

app.listen(port, () => console.log(`Example app listening on port ${port}!`));

But when I run the app with nodemon app.js, the port is 3000 instead of 4000. Why is my .env PORT variable undefined?

Solution

  • This code solves the issue

    require('dotenv').config();

const express = require('express');
const app = express();
const port = process.env.PORT;

app.get('/', (req, res) => {
  res.send('Hello World!!!');
});

app.listen(port, () => {
  console.log(`Example app listening at http://localhost:${port}`);
});